How did you manage to get to the school on time_________you missed the school bus?
| A．when | B．if |
| C．once | D．because |
It is still under discussion ________the old bus station should be replaced with a modern hotel or not.(2011·重庆)
| A．whether | B．when |
| C．which | D．where |
He is only too ready to help others，seldom，________refusing them when they turn
to him.
| A．if never | B．if ever | C．if not | D．if no |
The headmaster told the boy ________the angry teacher, but he refused to.
| A．to apologize | B．apologize to |
| C．to apologize for | D．to apologize to |
They are organizing a program to ________people's attention to protecting wild animals.
| A．give | B．pay | C．draw | D．have |
Completely ________in my writing, I didn't feel a heavy rain coming outside.
| A．absorbing | B．absorbed |
| C．losing | D．caught |